Do you have a standard airfilter / box or do you have an oiled one ? Have you cleaned it recently ?
As far as I know it's a standard airbox. I don't know whether it's a standard filter or an oiled one as I can't work out how to remove the box, even with a copy of the workshop manual to hand (I can't get to some of the bolts)
I would hope it's an oiled one because at least then I know the problem. However, the MAF looks clean and there is no residue on it - hopefully it's just a faulty part